Composite air vent
Keywords:
Valve Encyclopedia
Category:
- Product Description
-
Overview
This series of composite air vents is suitable for installation at pump discharge outlets or in water supply and distribution pipelines. They are designed to remove large accumulations of air from the pipeline, as well as to vent small amounts of air that may collect at higher points in the pipeline into the atmosphere. This helps improve the efficiency of both the pipeline and the pumping equipment. Moreover, when negative pressure occurs within the pipeline, this valve promptly draws in ambient air to prevent damage caused by such negative pressure.
Operating principle
When water begins to be injected into the pipe, the plug remains in the open position, allowing large volumes of air to escape. Once all the air has been expelled, water starts accumulating inside the valve, causing the float to rise and the piston to move to the closed position, thereby stopping the excessive air venting. As normal water flow resumes in the pipe, if a small amount of air accumulates inside the valve to a certain extent, the water level within the valve will drop, causing the float to descend as well. At this point, the air is released either through the small hole in the valve or via the small opening of the automatic air-release valve. When the pump stops and the pipe becomes empty of water, or when negative pressure develops inside the pipe, the piston rapidly opens, drawing in air to ensure the pipeline’s safety.
Technical Parameters
Air shut-off pressure MPa
≥0.07
Water shut-off pressure MPa
0.02-PN
Valve body test pressure MPa
1.5/2.4/3.75
Sealing test pressure MPa
1.1/1.76/2.75
Pressure Test Standard
GB/13927-92
Name and Material of Main Parts
Serial number
Mingcheng
Material
1
Valve body
Ductile iron
2
Valve cover
Ductile iron
3
O-ring
Nitrile rubber
4
Piston frame
Aluminum bronze
5
Sealing ring
Nitrile rubber
6
Piston
Stainless steel
7
Float ball
Stainless steel
8
Exhaust hood
Ductile iron
9
Automatic air vent
Component
CARX Series Composite Air Vent Valve (for Clear Water)
Pressure rating: PN 1.0/1.6 MPa
Nominal diameter: DN25–80 mm
(DN25 is threaded; the rest are flanged.)
External dimensions
Nominal diameter DN
Product Code
PN (MPa)
D1
D2
t
n-d
H
A times B
25
CARX-0025
1.0
ZG1"
1
/
/
-260
145×145
1.6
ZG1"
/
/
50
CARX-0050
1.0
125
165
19
4-φ19
-320
162×162
1.6
125
165
19
4-φ19
80
CARX-0080
1.0
160
200
19
8-φ19
-365
198×198
1.6
160
200
19
8-φ19
Pressure rating: PN 1.0/1.6 MPa
Nominal diameter: DN100–400 mm
External dimensions
Nominal diameter DN
Product Code
PN (MPa)
D1
D2
t
n-d
H
H1
L
D3
100
CARX-0100
1.0
180
220
19
8-φ19
-412.7
-398
-425
φ280
1.6
180
220
19
8-φ19
150
CARX-0150
1.0
240
285
19
8-φ23
-446.5
-444.5
-505
φ356
1.6
240
285
19
8-φ23
200
CARX-0200
1.0
295
340
20
8-φ23
-563
-546
-581
φ446
1.6
295
340
20
12-φ23
250
CARX-0250
1.0
350
395
22
12-φ23
-755
-685
-800
φ500
1.6
355
405
22
12-φ28
300
CARX-0300
1.0
400
445
24.5
12-φ23
-870
-790
-905
φ605
1.6
410
460
24.5
12-φ28
400
CARX-0400
1.0
515
565
24.5
16-φ28
-893
-935
-991
φ740
1.6
525
580
28
16-φ31
Note: Our company can manufacture valves of the specifications listed above with a PN rating of 2.5 MPa. If you have any requirements, please feel free to contact our office for further discussion.
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Company address:
No. 55, Jinjiangnan Road, Shangjie District, Zhengzhou City, Henan Province
Phone:+86-371-68122889
Email:zzsfmjt@126.com
Mobile phone:+86-13703990948
Fax:0371-68122899
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